Search for point-like sources of cosmic rays with energies above 1018.5 eV in the HiRes-I monocular data set

R. U. Abbasi, T. Abu-Zayyad, J. F. Amann, G. Archbold, K. Belov, J. W. Belz, S. BenZvi, D. R. Bergman, S. A. Blake, Z. Cao, B. M. Connolly, W. Deng, Y. Fedorova, J. Findlay, C. B. Finley, R. C. Gray, W. F. Hanlon, C. M. Hoffman, M. H. Holzscheiter, G. A. HughesP. Hüntemeyer, B. F. Jones, C. C.H. Jui, K. Kim, M. A. Kirn, E. C. Loh, M. M. Maestas, N. Manago, L. J. Marek, K. Martens, J. A.J. Matthews, J. N. Matthews, S. A. Moore, A. O'Neill, C. A. Painter, L. Perera, K. Reil, R. Riehle, D. Rodriguez, M. D. Roberts, M. Sasaki, S. R. Schnetzer, L. M. Scott, G. Sinnis, J. D. Smith, P. Sokolsky, C. Song, R. W. Springer, B. T. Stokes, J. R. Thomas, S. B. Thomas, G. B. Thomson, D. Tupa, S. Westerhoff, L. R. Wiencke, A. Zech, X. Zhang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We report the results of a search for point-like deviations from isotropy in the arrival directions of ultra-high energy cosmic rays in the northern hemisphere. In the monocular data set collected by the High-Resolution Fly's Eye, consisting of 1525 events with energy exceeding 1018.5 eV, we find no evidence for point-like excesses. We place a 90% c.l. upper limit of 0.8 hadronic cosmic rays/km2 yr on the flux from such sources for the northern hemisphere and place tighter limits as a function of position in the sky.

Original languageEnglish (US)
Pages (from-to)512-520
Number of pages9
JournalAstroparticle Physics
Issue number6
StatePublished - Jul 2007

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


  • Anisotropy
  • Cosmic rays
  • HiRes
  • Point source


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